Features 1、Made of carbon steel, hex handle, grinder chuck accessory can be easy to install. 2、Easy to use, such drill chuck can quickly lock and release the drill bit. And its clamping range is 0.3-3.2 mm. Without key mandrel tightening, it can be easy to replace the drill bit. 3、These industrial tools can be widely used in car, garages, warehouses, offices, houses, etc. 4、And grinder chuck accessory can instantly convert impact to non‑drill bits for quick exchange and drive positions. 5、Built to strict quality control standards, drill chuck adapter rod's design is improved for more durability. Specification Item Type: Grinder chuck accessory Material: Alloy Colour: Black Product Size: Approx. 7 x 2.5cm / 2.76 x 0.98in Tail Hole Size: M8 x 0.75 Rod Diameter: Approx. 6.35mm / 0.25in (1/4 inch, standard hex rod) Clamping Range: Approx. 0.3 ~ 3.2mm / 0.01 ~ 0.13in Package List 1 x Drill Chuck 1 x Hex Rod